San Diego County, San Diego Rat Control Situation:
Hi David, Is a UV blacklight still useful, exterior-wise, if it rains after the rodents leave their urine stains? I am in the process of performing exterior maintenance to better exclude my roof rats. 1) I have a 25 year old cedar shake roof in San Diego California with openings under each shake along the rake edge of the roof at the gable ends of my house. There's no drip edge, i.e. under the shakes I have roofing paper (now somewhat curled) that runs more or less up to and rests right atop the fascia board. Because I have skip sheathing, and since the cross section of a shake is a wedge that is up to one inch at the upper, thick end, this appears to create many huge entry points along the rake edges even though the sheathing is rabbeted into the fascia board. As a result, I'm thinking of getting a UV blacklight to use outside the house to sleuth for urine stains along the upper edge of the gable end shakes and fascia boards. My question is, how easily does the winter rain wash away the urine, rendering this a pointless exercise? 2) I noticed a new product called "rat-out gel" and was thinking of applying it along the rake edges mentioned above. Or, maybe I should just buy many rolls of X-Clude and use that instead. Or maybe both. Any comment? Thanks very much for your website, Doug
My response: First off, I do not have experience using UV lights to detect rat urine. But I do suspect that rain will severely limit the effectiveness of this approach. I have never heard of Rat-Out Gel or XClude, but I typically stick to physical barriers rather than repellent type devices. If your roof makes this impossible, you might have a tough time keeping the rats out.
San Diego Rat Control Tip of The Week
Are rats hibernating creatures?
Rats are nocturnal:
Rats sleep a lot even without cold conditions. The average rat will sleep between 12 to 15 hours a day and in colder conditions they will often seek warmth so that they can sleep safely for this amount of time. Because rats often walk around at night, detecting them can be somewhat difficult. Making sure that you can detect them often means checking into areas where they could nest or remaining somewhat attuned to what is going on in the night time when they are most active.
Rats breed throughout the year:
Even in the wintertime rats are continuing to breed, make their nests, and live without any issues. They don't hibernate during winter. Instead, rats will continue to breed. Most rats are able to wean a litter in about one month and leave the babies to fend for themselves after that period of time.
Rats will seek spaces to live:
Even though they don't hibernate, rats will seek warm and safe conditions. This means that in the wintertime it's likely that they will be looking for space inside your home where they can spend time sheltering throughout the winter. Spotting areas were rats can get into your home can be important to preventing an infestation.
Food gets scarce in winter:
If you are in an area where the climate gets cold this can lead many rats to find an area where they can access food much easier. Rather than getting stuck with very little food supply over several months, they can detect food that's in your home and then stay close to it.
